Danfoss AK2-SC 255, Reference Manual, Page: 130 / 206

RS.8D.M1.22 AK2-SC 255 Reference Manual 129
to some extent on the way rack configuration questions were answered. The alarms
for the lead compressor will be listed first, and similar alarms will follow for the other
compressors on the rack. Listing all the types of alarms, they are:
High Pressure (discharge pressure sensor)
An analog alarm, set for a pressure from -999.9 to 999.9 psi or bar and a time limit of
from 1 to 9999 seconds, minutes, or hours.
Comp. short cycle (compressor digital sensor)
A cycle digital alarm, with the trip level a number of cycles (0-9) in a specified time
period (1 to 9999 seconds, minutes, or hours).
Comp. oil failure (if an oil failure digital is configured)
A digital alarm that can be enabled to occur when the oil failure sensor is on for a
specified time period (1-9999 seconds, minutes, or hours).
High oil resets (if an oil reset switch monitor is configured)
A cycle digital alarm, with the trip level a number of cycles in a specified time period
(1-9999 seconds, minutes, or hours).
High Temperature (if a discharge temperature sensor is configured)
An analog alarm set for a temperature from -999.9 to 999.9 degrees with a time limit
from 1 to 9999 seconds, minutes, or hours).
High inverter resets (if variable speed is configured and the reset is moni-
tored)
A cycle digital alarm, with the trip level a number of cycles (0-9) in a specified time
period (1-9999 seconds, minutes, or hours).
Inverter failure (if variable speed is configured and the inverter bypass is
monitored)
A digital alarm that can be enabled to occur when the inverter is in bypass for a
specified time period (0-9999 seconds, minutes, or hours).
Configuring
Circuit alarms
The third selection on the rack alarm configuration menu is Circuits. The types of
alarms that present themselves depend upon whether the circuit is directly controlled
by SC 255 I/O, or by one of the various types of Danfoss case controllers.After
selecting Circuits from the rack alarms menu (shown once again at left) you will be
presented with a list of configured evaporator circuits (which will vary greatly de-
pending on what circuits you have configured). A list of typical circuits is shown at
right.